They differ either in the colour or in the pattern. This makes it easy to distinguish the upper edge from the lower edge and facilitates tightening the individual fabric bands. Read more Please take note that colours may be displayed differently on different screens or monitors which is due to different screen technologies or to individual screen settings. For this reason, the colours displayed on your screen/monitor may deviate slightly from those of our product photos. If you are not sure, please compare on another display or contact us.